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Layout: Continue support incremental box tree reconstruction for flex&taffy level box (#37854)

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Layout: Continue support incremental box tree reconstruction for
flex&taffy level box

This change reuse the flex/taffy level box from old box slot if the box
slot is valid and there is no LayoutDamage to the element.

Testing: This should not change observable behavior and is thus covered
by existing WPT tests.

Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
This commit is contained in:
JoeDow 2025-07-04 17:35:09 +08:00 • committed by GitHub
parent 934b3341d7
commit 068406ee6e
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GPG key ID: B5690EEEBB952194
3 changed files with 59 additions and 32 deletions
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53
components/layout/construct_modern.rs
View file

@ -12,7 +12,7 @@ use style::selector_parser::PseudoElement;
use crate::PropagatedBoxTreeData;
use crate::context::LayoutContext;
use crate::dom::BoxSlot;
use crate::dom::{BoxSlot, LayoutBox};
use crate::dom_traversal::{Contents, NodeAndStyleInfo, TraversalHandler};
use crate::flow::inline::construct::InlineFormattingContextBuilder;
use crate::flow::{BlockContainer, BlockFormattingContext};
@ -78,10 +78,9 @@ impl<'dom> ModernContainerJob<'dom> {
};
Some(ModernItem {
kind: ModernItemKind::InFlow,
kind: ModernItemKind::InFlow(formatting_context),
order: 0,
box_slot: None,
formatting_context,
})
},
ModernContainerJob::ElementOrPseudoElement {
@ -91,6 +90,25 @@ impl<'dom> ModernContainerJob<'dom> {
box_slot,
} => {
let is_abspos = info.style.get_box().position.is_absolutely_positioned();
let order = if is_abspos {
0
} else {
info.style.clone_order()
};
if let Some(layout_box) = box_slot
.take_layout_box_if_undamaged(info.damage)
.and_then(|layout_box| match &layout_box {
LayoutBox::FlexLevel(_) | LayoutBox::TaffyItemBox(_) => Some(layout_box),
_ => None,
})
{
return Some(ModernItem {
kind: ModernItemKind::ReusedBox(layout_box),
order,
box_slot: Some(box_slot),
});
}
// Text decorations are not propagated to any out-of-flow descendants. In addition,
// absolutes don't affect the size of ancestors so it is fine to allow descendent
@ -108,21 +126,16 @@ impl<'dom> ModernContainerJob<'dom> {
propagated_data,
);
if is_abspos {
Some(ModernItem {
kind: ModernItemKind::OutOfFlow,
order: 0,
box_slot: Some(box_slot),
formatting_context,
})
let kind = if is_abspos {
ModernItemKind::OutOfFlow(formatting_context)
} else {
Some(ModernItem {
kind: ModernItemKind::InFlow,
order: info.style.clone_order(),
box_slot: Some(box_slot),
formatting_context,
})
}
ModernItemKind::InFlow(formatting_context)
};
Some(ModernItem {
kind,
order,
box_slot: Some(box_slot),
})
},
}
}
@ -146,15 +159,15 @@ impl ModernContainerTextRun<'_> {
}
pub(crate) enum ModernItemKind {
InFlow,
OutOfFlow,
InFlow(IndependentFormattingContext),
OutOfFlow(IndependentFormattingContext),
ReusedBox(LayoutBox),
}
pub(crate) struct ModernItem<'dom> {
pub kind: ModernItemKind,
pub order: i32,
pub box_slot: Option<BoxSlot<'dom>>,
pub formatting_context: IndependentFormattingContext,
}
impl<'dom> TraversalHandler<'dom> for ModernContainerBuilder<'_, 'dom> {